Refactor string concatenation method

Changed the method of concatenating strings from Path.Combine() to string interpolation for creating URLs in the Kinde authentication system. Now, the "Domain" configuration is also being trimmed at the end to ensure a clean and proper URL is created using string interpolation.

KindeAuthenticationBuilderExtensions.cs

@@ -37,13 +37,13 @@ public static AuthenticationBuilder AddKindeJwtBearerAuthentication(this IServic
         kindeAuthenticationOptions(configOptions);
 
         if (string.IsNullOrEmpty(configOptions.Domain))
-            configOptions.Domain = GetRequiredConfiguration("Kinde:Domain", configuration);
+            configOptions.Domain = GetRequiredConfiguration("Kinde:Domain", configuration).TrimEnd('/');
         if (string.IsNullOrEmpty(configOptions.ClientId))
             configOptions.ClientId = GetRequiredConfiguration("Kinde:ClientId", configuration);
         if (string.IsNullOrEmpty(configOptions.ClientSecret))
             configOptions.ClientSecret = GetRequiredConfiguration("Kinde:ClientSecret", configuration);
         if (string.IsNullOrEmpty(configOptions.ManagementApiAudience))
-            configOptions.ManagementApiAudience = Path.Combine(configOptions.Domain, "api");
+            configOptions.ManagementApiAudience = $"{configOptions.Domain}/api";
         if (string.IsNullOrEmpty(configOptions.JwtAudience))
             configOptions.JwtAudience = GetRequiredConfiguration("Kinde:JwtAudience", configuration);
 
@@ -65,7 +65,7 @@ public static AuthenticationBuilder AddKindeJwtBearerAuthentication(this IServic
                 {
                     var client = new HttpClient();
                     // TODO: cache this?
-                    var response = client.GetAsync(new Uri(Path.Combine(configOptions.Domain, ".well-known/jwks"))).Result;
+                    var response = client.GetAsync(new Uri($"{configOptions.Domain}/.well-known/jwks")).Result;
                     var responseString = response.Content.ReadAsStringAsync().Result;
                     return JwksHelper.LoadKeysFromJson(responseString);
                 }
@@ -205,15 +205,15 @@ public static AuthenticationBuilder AddKindeIdentityAuthentication(this IService
         kindeAuthenticationOptions(configOptions);
 
         if (string.IsNullOrEmpty(configOptions.Domain))
-            configOptions.Domain = GetRequiredConfiguration("Kinde:Domain", configuration);
+            configOptions.Domain = GetRequiredConfiguration("Kinde:Domain", configuration).TrimEnd('/');
         if (string.IsNullOrEmpty(configOptions.ClientId))
             configOptions.ClientId = GetRequiredConfiguration("Kinde:ClientId", configuration);
         if (string.IsNullOrEmpty(configOptions.ClientSecret))
             configOptions.ClientSecret = GetRequiredConfiguration("Kinde:ClientSecret", configuration);
         if (string.IsNullOrEmpty(configOptions.SignedOutRedirectUri))
             configOptions.SignedOutRedirectUri = GetRequiredConfiguration("Kinde:SignedOutRedirectUri", configuration);
         if (string.IsNullOrEmpty(configOptions.ManagementApiAudience))
-            configOptions.ManagementApiAudience = Path.Combine(configOptions.Domain, "api");
+            configOptions.ManagementApiAudience = $"{configOptions.Domain}/api";
 
         services.AddHttpClient();
         services.AddHttpContextAccessor();

ManagementApi/KindeManagementApiAuthenticationHelper.cs

@@ -26,7 +26,7 @@ public async Task<string> GetAuthTokenAsync()
         content.Headers.Clear();
         content.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
 
-        var response = await client.PostAsync(Path.Combine(options.Domain, "oauth2/token"), content).ConfigureAwait(false);
+        var response = await client.PostAsync($"{options.Domain}/oauth2/token", content).ConfigureAwait(false);
         if (!response.IsSuccessStatusCode)
         {
             logger.LogCritical(@"Unable to authenticate with Kinde Management API {StatusCode} {Error}",